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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Summary of components of other comprehensive income
The cumulative balance of each component of other comprehensive income (loss) and the income tax effects allocated to each component are as follows:

  
Pension and other post-retirement actuarial items
  
Currency translation adjustment
  
Unrealized gain (loss) on available-for-sale securities
  
Total
 
             
Balance at January 1, 2016
 
$
(136,422
)
 
$
4,597
  
$
498
  
$
(131,327
)
Other comprehensive income before reclassifications
  
(32,398
)
  
(35,863
)
  
941
  
$
(67,320
)
Tax effect
  
9,815
   
-
   
(329
)
 
$
9,486
 
Other comprehensive income before reclassifications, net of tax
  
(22,583
)
  
(35,863
)
  
612
  
$
(57,834
)
Amounts reclassified out of AOCI
  
91,014
   
-
   
-
  
$
91,014
 
Tax effect
  
3,495
   
-
   
-
  
$
3,495
 
Amounts reclassified out of AOCI, net of tax
  
94,509
   
-
   
-
  
$
94,509
 
Net comprehensive income (loss)
 
$
71,926
  
$
(35,863
)
 
$
612
  
$
36,675
 
Balance at December 31, 2016
 
$
(64,496
)
 
$
(31,266
)
 
$
1,110
  
$
(94,652
)
Other comprehensive income before reclassifications
  
(15,671
)
  
124,220
   
1,881
  
$
110,430
 
Tax effect
  
4,373
   
-
   
(659
)
 
$
3,714
 
Other comprehensive income before reclassifications, net of tax
  
(11,298
)
  
124,220
   
1,222
  
$
114,144
 
Amounts reclassified out of AOCI
  
9,147
   
-
   
(817
)
 
$
8,330
 
Tax effect
  
(2,394
)
  
-
   
286
  
$
(2,108
)
Amounts reclassified out of AOCI, net of tax
  
6,753
   
-
   
(531
)
 
$
6,222
 
Net comprehensive income (loss)
 
$
(4,545
)
 
$
124,220
  
$
691
  
$
120,366
 
Balance at December 31, 2017
 
$
(69,041
)
 
$
92,954
  
$
1,801
  
$
25,714
 
Cumulative effect of accounting for adoption of ASU 2016-01
  
-
   
-
   
(1,801
)
  
(1,801
)
Other comprehensive income before reclassifications
  
5,617
   
(41,454
)
  
-
  
$
(35,837
)
Tax effect
  
(1,032
)
  
-
   
-
  
$
(1,032
)
Other comprehensive income before reclassifications, net of tax
  
4,585
   
(41,454
)
  
-
  
$
(36,869
)
Amounts reclassified out of AOCI
  
8,343
   
-
   
-
  
$
8,343
 
Tax effect
  
(2,178
)
  
-
   
-
  
$
(2,178
)
Amounts reclassified out of AOCI, net of tax
  
6,165
   
-
   
-
  
$
6,165
 
Net comprehensive income (loss)
 
$
10,750
  
$
(41,454
)
 
$
-
  
$
(30,704
)
Balance at December 31, 2018
 
$
(58,291
)
 
$
51,500
  
$
-
  
$
(6,791
)